Loom



Nv. 4, 19415. K, scHwABE LOOM Filed Dec. 7, 1937 2 Sheets-Sheet 2 Patented Nov. 4, 1941 LOOM Kurt Schwabe, Bielitz-Bielsko, Poland Application December 7, 1937, Serial No. 178,450 In Great Britain August 14, 1937 2 Claims.

The present invention relates to improvements in weaving looms. Referring to looms of the prior art in order to enable the shuttle with empty bobbin to enter the exchange box, the picker with the picking stick is drawn out of reach of the shuttle path by means of an eccentric which is set in rotation during the bobbin exchange through the agency of a system of rods, while a second picker arranged behind the exchange box and a second picking stick throw the shuttle, after completion of the bobbin exchange, with the full bobbin into the corresponding shuttle box compartment. This arrangement has several disadvantages, for instance the requirement of duplicate pickers and picking sticks. Further, the throwing back of the shuttle with the full bobbin is not positive but the result of a short stroke, which involves the fact that a denite position of the shuttle in the shuttle box compartment, after the bobbin exchange, can be obtained only with difficulty or in a very complicated manner. On the other hand the correct and precise position of the shuttle in the shuttle box is an essential condition for the even and safe beat in the loom.

The appliance has the further disadvantage that the picker cannot be drawn out of reach of the shuttle path, if, owing to a faulty adjustment of the beat and the simultaneously initiated bobbin exchange, the beat takes place also on the exchange side. In this case the picker can no longer protrude through the slots in the back of the shuttle box, and the impossibility of drawing it out of the path when in this position leads either to the breaking of a part or requires very complicated and awkward safety measures.

The present invention obviates all these disadvantages inasmuch as the picker in the device according to the present invention is left within the range of the shuttle path, whereby the path into the exchange boxes is cleared for the shuttle by means of a simple adjustment of the picking stick parts, preferably of the picking stick on the exchange side. This release also takes place in the event of faulty adjustment of the picking catches, since the picking stick on the exchange side can be adjusted in any position along its entire path, so that also after the stroke is complete, the shuttle running in from the feeler side with the empty bobbin is enabled to enter the exchange box. As according to the present invention the picker is left in the slay path, the shuttle, after the exchange stage is effected,

can be pushed back into the shuttle box compartment by means of the same picker, and since this picker, contrary to the picker of known devices, need no longer return to its extreme position, the pushing back of the shuttle from the beginning to its end can take place positively, whereby a constant and continuous position ofthe shuttle in the shuttle box is obtained. Finally, the present invention dispenses with a great number of parts, as Well as with the second picking stick of the known device, since the pushing back of the shuttle into the shuttle box compartment after the stage of exchange is effected by means of a shaft which is set in rotation at a given moment, which shaft engages a rack by means of a toothed wheel. This shaft is preferably driven by a small electric motor which is attached to the slay and which can be switched selectively, whereby the arrangement of the whole device gains in clearness and simplicity.

An embodiment of the invention is shown, by way of example, in the accompanying drawings, in which Fig. 1 is a rear view of the exchange side of the loom, in which the shuttle magazine has been omitted for the sake of clarity;

Fig. 2 is a side View of Fig. 1; and Fig. 3 is a sectional view taken from Fig. 1;

Fig. 4 is another rear view in which-several parts have been omitted;

Figs. 5, 6 and '7 show details of various parts detached;

Figs. 8, 9 and 10 are end views of the parts shown in Figs. 6-7;

Fig. 11 is a detail View showing the relationship of rails 22, 25a and 25h and associated parts.

In Fig. l, I is the frame of the loom, 2 is the drive rail or lay sword, 3 the lay, 4 the picker stick shaft, in which two bolts 5a, 5b are xed. On the latter a guide 6 is pivotally mounted, which guide permits a longitudinal movement of the picker stick I. Between two guides 8a, 8b rod 9 is held in position which through a slot I0 engages a bolt I I on the picking stick 'I. A bolt I2 on the rod 9 serves to articulatedly connect through rod I3 rod 9 with one end of a lever I4. The lever I4 is pivoted on bolt I5 resting on an extension of the lay sword 2 and carries at its other end a lever I6. A pull rod I'I connects the latter with the bobbin exchange driving parts (not shown), joined to a shaft which operates the weft replenishing means in a well known manner.

On a boss of the guide 6 the locking pawl or catch I8 is pivoted which pawl is adapted to be positioned beneath the picking stick 1 so that the downward movement of the latter is limited. The locking pawl I8 has a knob or extension I9 which comes to lie in front of a curved prolongation of the rod 9. An abutment on the picking stick 1, which abuts against the guide 6, limits the upward path of the picking stick, and an abutment 2| at the lay sword 2 limits its outward path.

A rail 22 is screwed on to the lay sword 2 and is held at its outer end by the magazine frame 23 and has a bore 24 (Fig. 2). .Furthermore, rails 25a, 25h are secured to the lay sword 2. The rail 25h has been omitted in Figs. 1 and 4 for the sake of clarity. A rail 26 with two bearings 21 and 28 (Fig. 6) slides in a rectangular slideway formed by the lay sword 2 and the rails 25a and 251). This rail 26 carries the rack bar 29 in a suitable cut-out. This rack bar 29 is in engagement with a pinion 30 on the motor shaft 3| of the motor 32, which is mounted on the lay sword 2. Furthermore, the two round guide pins 33 and 36 (Fig. 4) are mounted on the lay sword 2 and serve to carry the bearing 35 permitting the latter to have an axial displacement. The guiding pin 33 has an abutment 34 at its outer end, while between the abutment 31 of the guide pin 36 and the bearing 35 a spring 38 is located. The bearing 35 has a bore 39 which is in the same plane with the bore 28 of the part 26. The picker spindle 40, on which the picker 4|, which normally grips the picking stick 1, runs to and fro, has the abutment 42 at its end which faces the centre of the loom, while its outer end is fixed to the part 43. A guide pin 44 is also fixed in the part 43, in such a manner that the distance of the picker spindle 4D from the guide pin 44 is the same as the distance betweenthe bores 21 and 28 in the rail 26, The guide rod 44 has a pickingup member or dog 45 and is held in the bore 24 of rail 22, so that it runs through the bore 21 in the rail 26, while the picker spindle 40 is held by means of the bores 28 and 39. tion of the rail 26 is secured by means of a pawl 46 which is rotatably mounted on the bolt 41 on the lay sword 2, and is drawn upwardly by means of a spring 48. In the rest position pawl 46 comes to lie in front of the rail 26, as well as in front of an inclined surface 49 of the rack bar 29.

The mode of operation of the device is as follows.

When the shuttle exchange is initiated, the

lever I6 is moved from its rest position, (by means of an eccentric (not shown) on a shaft, for example, exchange shaft, which is set into rotation) upwardly against the action of a spring (not shown) and is set into action, so that the lever I4 and with it the rods 9 and I3 move downwardly. The rod 9 pushes, with its curveshaped prolongation, during the first stage of its movement, the pawl I8 out of the path of the picker stick 1, whereupon the upper end of the slot I0 engages bolt I I, and in the following stage of movement the picker stick 1 is drawn downwardly until it releases the picker 4| (Fig. 4).

At the same time when the bobbin exchange has been initiated and depending upon the position of the above mentioned rotated exchange shaft during the bobbin exchange, the motor 32 is switched on by means of a switch (not shown). This motor, during the rst stage of its movement, moves outwardly the rack bar 29 by means The rest posiof the pinion 30. The rail 26 is still secured during the starting of the motor, against displacement by the pawl 46, but the inclined surface 49 of the rack bar 29 depresses the pawl during the displacement of the rack bar 29, and permits the part 26 to move out. This is effected in such a way that the cam 50 of the rack bar 29 comes to lie against a protruding ledge 5|' in the rail 26, and carries said rail with it. The rail 26, driven by the motor, now moves outwardly until it arrives at the part 43, whereupon from this moment onwards it also carries along the picker spindle 4l) and pulls it outwardly. The abutment 42 of the picker spindle 49 comes to lie, during the further course of the movement, against the bearing 35, and pulls this likewise outwardly up to the abutment 31, by compressing the spring 38 sufciently, and thereby the kinetic energy of all moving parts is diminished. In its extreme end position, rail 26 comes to lie Within a cut-out 52 of the locking pawl 46 and enables the latter to catch into this cut-out. If a moment later the motor is switched oi, the rail 26, under the pressure of the spring 38, tends to return to its initial position, but is prevented from doing so by the locking pawl 46 which has caught into the cut-out 52.

The shuttle now enters the shuttle box and arrives in the exchange box, Where the bobbin is to be exchanged. In doing so it carries the picker with it until the latter comes to lie against the part 43, whereby at the same time the outward travel of the shuttle is limited.

After the bobbin exchange, the polarization of the motor with the connecting shaft is reversed, and it rotates in the opposite direction. During its iirst revolutions it moves the rack bar 29 towards the centre of the loom, and the latter depresses the locking pawl 46 by means of its inclined prolongation 53, whereupon the rail 26 is carried along by means of the rack bar 29, since, during a further displacement, the cam 54 on the rack bar 29 comes to lie on the protruding ledge or shoulder 5| of the rail 25. By the movement of the rail 26, the shuttle is pushed back from the exchange box into the shuttle box, the spring 38 assisting this movement. Thereby the rail 26 grips the dog 45 and during its further movement also returns the picker spindle 4D to its rest position. When the rail 26 has reached its rest position, the pawl 46 snaps in again behind it, whereupon the motor is switched olf.

After the pushing back of the shuttle into the shuttle box has been completed, the eccentric again releases the lever I6 on the connecting shaft, which lever has a downward tendency arising from the heretofore mentioned spring which is not shown. Thereby the lever I4 and the rod 9 are raised. The rst stage of the movement is without influence on the position of the picking stick, but as soon as the lower end of the slot I0 comes to lie against the bolt II, the picking stick is also drawn upwardly until the abutment 2B comes to lie against the guide 6 and the pawl I8 can snap below the said picking stick.

I claim:

l. In a weft replenishing loom having a picker, a picker stick, and a shuttle box at one end of the lay in longitudinal alignment with an auxiliary shuttle box into which, when a weit replenishment is to be effected, the empty shuttle is shot from the opposite end of the loom; the combination of means for releasing said picker stick to allow it to fall down from engagement with said picker during weft replenishment period of said loom whereby to permit the empty shuttle to contact said picker as it passes from said shuttle box into said auxiliary shuttle box and to push said picker ahead of it, means for maintaining said picker stick in its out-of-engagement position with respectl to said picker, means for limiting the outward movement of said picker, means for returning said picker and shuttle into operative position, and means actuating said releasing means to reposition said Dicker stick after weft replenishment has been ei'ected to reestablish operative connection between said picker and said picker stick.

2. In a weft replenishing loom having a picker, a picker stick, a spindle upon which said picker is slidable, and a shuttle box at one end of the lay in longitudinal alignment with an auxiliary shuttle box into which, when a weft replenishment is to be effected, thev empty shuttle is shot from the opposite end of the loom; the combination of means for releasing said picker stick to fall down from engagement with said picker during weft replenishment period of said loom whereby to permit said empty shuttle as it passes from said shuttle box into said auxiliary shuttle box to push said picker ahead of it, means for maintaining said picker stick in its out-of-engagernent position with respect to said picker, means for limiting the outward movement of said picker, one or more bearings for said spindle, means for longitudinally displacing said spindle and said bearings during weft replenishment period and while said picker is out of engagement with said picker stick, means for returning said picker and shuttle into operative position, and means actuating said releasing means to reposition said picker stick after weft replenishment has been effected to reestablish operative connection between said picker and said picker stick, said returning means including a motor having a pinion, and a slidable rack in engagement with said pinion.

KURT SCHWABE. 

